IL229075A - Process for the preparation of benzyl [(3as,4r,6s,6ar)-6-hydroxy-2,2- dimethyltetrahydro-3ah-cyclopenta[d][1,3]dioxol]-4-yl]carbamate and intermediates in the process - Google Patents
Process for the preparation of benzyl [(3as,4r,6s,6ar)-6-hydroxy-2,2- dimethyltetrahydro-3ah-cyclopenta[d][1,3]dioxol]-4-yl]carbamate and intermediates in the processInfo
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- IL229075A IL229075A IL229075A IL22907513A IL229075A IL 229075 A IL229075 A IL 229075A IL 229075 A IL229075 A IL 229075A IL 22907513 A IL22907513 A IL 22907513A IL 229075 A IL229075 A IL 229075A
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- dioxol
- cyclopenta
- hydroxy
- dimethyltetrahydro
- compound
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- C—CHEMISTRY; METALLURGY
- C07—ORGANIC CHEMISTRY
- C07B—GENERAL METHODS OF ORGANIC CHEMISTRY; APPARATUS THEREFOR
- C07B57/00—Separation of optically-active compounds
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- C—CHEMISTRY; METALLURGY
- C07—ORGANIC CHEMISTRY
- C07D—HETEROCYCLIC COMPOUNDS
- C07D317/00—Heterocyclic compounds containing five-membered rings having two oxygen atoms as the only ring hetero atoms
- C07D317/08—Heterocyclic compounds containing five-membered rings having two oxygen atoms as the only ring hetero atoms having the hetero atoms in positions 1 and 3
- C07D317/44—Heterocyclic compounds containing five-membered rings having two oxygen atoms as the only ring hetero atoms having the hetero atoms in positions 1 and 3 ortho- or peri-condensed with carbocyclic rings or ring systems
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- C—CHEMISTRY; METALLURGY
- C07—ORGANIC CHEMISTRY
- C07B—GENERAL METHODS OF ORGANIC CHEMISTRY; APPARATUS THEREFOR
- C07B53/00—Asymmetric syntheses
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- Organic Low-Molecular-Weight Compounds And Preparation Thereof (AREA)
Description
A process for the preparation of benzyl [(3aS,4R,6S,6aR)-6-hydroxy-2,2-dimethyltetrahydro-3aH-cyclopenta[d][1 ,3]dioxol]-4-yl]carbamate and intermediates in the process.
Field of the invention The present invention is directed to a process for the preparation of benzyl [(3a.V,4//,6/>,,6a//)-6-hydroxy-2,2-dimethyltetrahydro-3a//-cyclopenta[6/][ l ,3]dioxol-4- yljcarbamate (VI), an intermediate useful in the synthesis of pharmaceuticals, for example Ticagrelor, to products of said process and the use thereof.
Background The synthesis of comnounds till and 11111 are described in Tetrahedron 1997. 53. 3347.
(II) (III) The syntheses of either the free amine or the hydrochloride salt of compound (IV) are described in WO99/05142, Tetrahedron Lett., 2000, 4J 9537 and Synth. Commun. compound (IV) is described in WO 2009/064249.
The synthesis of benzyl [(3 a.V,4/t,6,.y,6a/t)-6-hydroxy-2, 2-dim ethyl tetrahydro-3a//- cyclopenta[i/][1,3]dioxol-4-yl]carbamate (VI) is described in WOOO/34283 and WO 01/92263.
Description of the invention The present invention is directed to a process for the preparation of benzyl [(3a»V,4/^6S',6a/^)-6-hydroxy-2,2-dimethyltetrahydro-3a//-cyclopenta[6/][ l ,3]dioxol-4-yl] carbamate (VI), comprising the steps of (a) mixing a compound of formula (III), (III), with an enantiomerically pure protected amino acid to form a diastereoisomeric salt, (b) crystallizing said salt to deliver a protected amino acid salt of a compound of formula (IV), (c) treating the protected amino acid salt of the compound of formula (IV) with an acid, and (d) reacting the product from c) with benzyl chloroformate in the presence of a suitable base, such as potassium carbonate.
The process according to the present invention is particularly useful for large-scale production of benzyl [(3 a.V,4/i,6,.y, 6a/i)-6-hydroxy-2, 2-dim ethyl tetrahydro-3a//-cyclopenta[i/][1,3]dioxol-4-yl]carbamate (VI) by providing for example higher yields, less amounts of chemicals used in the process (or excluded), better volume capacity, shorter manufacturing time, more robust process with the possibility of recovery of the chiral protected amino acid as web as solvents used in the resolution.
The process for preparation of benzyl [(3ari,,4f?,6ri,,6ai?)-6-hydroxy-2,2-dimethyltetrahydro-3a//-cyclopenta[i/][l,3]dioxol-4-yl]carbamate (VI) may start from a compound of formula (III), which may be prepared by procedures known in the art. The compound of formula (III) is then resolved by crystallization of a diastereomerically pure salt using an enantiomerically pure protected amino acid to give the corresponding diastereomerically pure protected amino acid salt of the compound of formula (IV). The amino acid salt of the compound of formula (IV) is first treated with an acid and subsequently reacted with benzyl chloroformate in the presence of a suitable base, such as potassium carbonate, to deliver (VI).
Alternatively, the process for preparation of benzyl [(3ak,4A,6k,6aA)-6-hydroxy-2,2-dimethyltetrahydro-3a//-cyclopenta[i/][1,3]dioxol-4-yl]carbamate (VI) may start from a compound of formula (I), which may be prepared by procedures known in the art or as described in the Examples. Compound (I) is converted to compound (III) as known in the art or as described in the Examples. Subsequently, the compound of formula (III) is resolved by crystallization of a diastereomerically pure protected amino acid salt using an enantiomerically pure protected amino acid to give the corresponding diastereomerically formula (IV) is then treated with an acid and subsequently reacted with benzyl chloroformate in the presence of a suitable base, such as potassium carbonate, to deliver (VI) The following scheme illustrates the process for preparation of benzyl L^a ,^ ,o ,oa -o-nyaroxy- , -aimemyiieiranyaro- a 2-cyciopeniaL^jLi,^Jtiioxoi-^-yljcarbamate (VI) via (3ari,,4f?,6ri',6ai?)-6-hydroxy-2,2-dimethyltetrahydro-3ai/-cy cl opentafr/] [l , 3 ] di oxol-4-a i ni um (2ri)-2-[(/er/-butoxycarbonyl)amino]-3-phenylpropanoate (Va) or via (3ari,,4f?,6ri',6ai?)-6-hydroxy-2,2-dimethyltetrahydro-3ai/-cy cl opentafr/] [ l , 3 ] di oxol-4-a i ni um (2ri)-2-[(/er/-butoxycarbonyl)amino]-4-methylpentanoate (Vb): One embodiment of the present invention is a process for the preparation of a protected amino acid of the compound of formula (IV). A further embodiment of the present invention is the 1 : 1-salt between a protected amino acid and the compound of formula (IV). Still a further embodiment of the present invention is the 1 : 1-salt between L-Boc-phenyl alanine and the compound of formula (IV). Said salt can also be named N-(tertbutoxycarbonyl)-L-phenylalanine - (3ai?, 4S,6R, 6aS)-6-amino-2,2-dimethyltetrahydro-3a//-cy cl openta[r/] [1 , 3 ] di oxol-4-ol (1:1) or (3aV,4^,6V,6a/^)-6-hydroxy-2,2-di ethyltetrahydro-3 a//-cy cl openta[r/] [1 , 3 ] di oxol-4-am i ni um (2V)-2-[(/c77-butoxycarbonyl)amino]-3-n -henvlnron -anoate fVal S -till a f -urther e -mbo -diment of t -he n -resent inve -ntion is t -he 1 1 s -alt between L-Boc-leucine and the compound of formula (IV). Said salt can also be named N-( /e/V-b utoxy curb ony 1 )- L- 1 euci n e - (3a/^4S',6A6a»V)-6-amino-2,2-di ethyltetrahydro-3a//-cy cl openta[r/] [1 , 3 ] di oxol-4-ol (1:1) or (3aV,4^,6V,6a/^)-6-hydroxy-2,2-di ethyltetrahydro-3 a//-cy cl openta[r/] [1 , 3 ] di oxol-4-am i ni um (2V)-2-[(/c/7-butoxycarbonyl)amino]-4- In one embodiment of the invention, the protecting group for the enantiomerically pure protected amino acids is selected from Boc, Cbz or Bz. In a further embodiment of the invention, the enantiomerically pure protected amino acids suitable for use in the resolution step is selected from L-Boc-phenylalanine, L-Boc-leucine, Cbz-L-alanine, Bz-L-alanine, Cbz-L-phenylalanine, Boc-L-alanine, Cbz-L-tyrosine or Boc-L-tyrosine. In a further embodiment of the invention, the enantiomerically pure protected amino acid is selected from the opposite (D) enantiomers. In still a further embodiment of the invention, the enantiomerically pure protected amino acid is L-Boc-phenylalanine. In still a further embodiment of the invention, the enantiomerically pure protected amino acid is L-Bocleucine.
In one embodiment of the invention, solvents useful for the resolution step giving a diastereomerically pure salt of a compound of formula (IV) may be selected from aliphatic alcohols (such as methanol, ethanol, «-propanol, /50-propanol, «-butanol, /50-butanol or /c/V-butanol), aliphatic esters (such as ethyl acetate, butyl acetate or /50-propyl acetate), aliphatic ketones (such as acetone, methyl ethyl ketone (MEK) or methyl /50-butyl ketone (MIBK)), aromatic solvents (such as toluene or xylene) and mixtures thereof. In a further alcohols, aromatic solvents and mixtures thereof. In still a further embodiment of the present invention, the solvent in step (a) is a mixture of /50-propanol and an aromatic solvent. In still a further embodiment of the present invention, the solvent in step (a) is a mixture of /50-propanol and toluene. In still a further embodiment of the present invention, the solvent in step (a) is /50-propanol. In still a further embodiment of the present invention, the solvent in step (a) is a mixture of an aliphatic ketone and an aromatic solvent. In still a further embodiment of the present invention, the solvent in step (a) is a mixture of MIBK and an aromatic solvent. In still a further embodiment of the present invention, the solvent in step (a) is MIBK. In still a further embodiment of the present invention, the solvent in step (a) is a mixture of" methyl ethyl ketone and an aromatic solvent. In still a further embodiment of the present invention, the solvent in step (a) is MEK.
In one embodiment of the invention, the resolution with the enantiomerically pure protected amino acid is performed with 0.55 to 1.4 equivalents of enantiomerically pure protected amino acid to compound (III). In a further embodiment of the present invention, the resolution with the enantiomerically pure protected amino acid is performed with 0.5 to 0 R _ en 1uiva -lents o -f e -nantiomerioallv n A -nre n A -roteoted a -mino a -cid t -o- m -rr A-n -nrid P v TP , Tn s -till a — further embodiment of the present invention, the resolution with the enantiomerically pure protected amino acid is performed with 0.55 equivalents of enantiomerically pure protected amino acid to compound (III).
In one embodiment of the invention, the acid in step c) is selected from sulfuric acid, hydrochloric acid, hydrobromic acid, phosphoric acid, sodium hydrogen sulfate, sodium dihydrogenphosphate or an organic acid such as oxalic acid, malic acid, maleic acid or citric acid. In a further embodiment of the present invention, the acid in step c) is hydrochloric acid or oxalic acid.
In one embodiment of the invention, there is provided a protected amino acid salt of a compound of formula (IV), In one embodiment of the invention, there is provided the compound (3ari,,4f?,6ri',6ai?)-6-hydroxy-2,2-dimethyltetrahydro-3a//-cyclopenta[i/][1,3]dioxol-4-aminium (2ri)-2-[(/er/-butoxycarbonyl)amino]-3-phenylpropanoate (Va), In a further embodiment of the invention, there is provided the compound (3ari,,4f?,6ri',6ai?)-6-hydroxy-2,2-dimethyltetrahydro-3a//-cyclopenta[i/][l,3]dioxol-4- amininm In one embodiment of invention, the resolution step giving a diastereomerically pure salt of a compound of formula (IV) is initially performed at temperatures from 0 °C to the boiling point of the solvent to fully dissolve the components or the formed diastereoisomeric salts. When the components have been dissolved, in one embodiment of invention, the temperature of the solution is adjusted to a temperature of from -50 °C to +50 °C, to obtain a crystalline salt of the compound (IV). In a further embodiment of invention, when the components have been dissolved, the temperature of the solution is adjusted to a temperature of from -20 °C to 20 °C, to obtain a crystalline salt of the compound (IV). The salt may thereafter be recrystallized from a solvent similar or different to the one used above to improve the optical and chemical purity.
A further embodiment of the present invention is the use of the protected amino acid salt of the compound of forrou! a tiVt in †VIP nrpnaratinn rvf Tiraarplnr n s:. ri v On (l,S,*,2i?*),5 ]}-3-(7-{[2-(3,4-difluorophenyl)cyclopropyl]amino}-5-(propylthio)-3iT-1,2,3-triazolo[4,5-i/]pyrimidin-3-yl)-5-(2-hydroxyethoxy)cyclopentane-l,2-diol.
The term “diastereomerically pure salt” is defined as a salt between an enantiomerically pure cation (such as monocation of amine (IV) in the present invention) and an enantiomerically pure anion (protected amino acid monoanion in the present invention).
ABBREVIATIONS Boc tert- butoxycarbonyl Bz benzoyl Cbz carboxybenzyl MEK methyl ethyl ketone MIBK methyl Ao-butyl ketone EXAMPLES Example 1. Benzyl 2-oxa-3-azabicyclo[2.2.1]hept-5-ene-3-carboxylate (I) Cyclohexanone oxime (20.04 g, 171.8 mmol) and methyl /-butyl ether (1 10 mL) were added to a reactor at 25 °C and stirred under N2 (g). The solution was cooled to -10 °C and CI2 (g) was added during 15 min until a deep blue, clear solution was obtained. Vacuum was applied to remove remaining CI2 and possible HC1 from the reaction mixture. The temperature was set to -2 °C, and a solution of Na2CC>3 (11.03 g, 103 mmol) in water (90 mL) was slowly added during 30 min. The phases were separated and the organic phase transfered to a solution of Na2CC>3 (19.3 g, 180.3 mmol) in water (126 mL) at 15 °C. Benzyl chloroformate (32.3 g, 179.87 mmol) was added and the reactionmixture stirred for 10 min after which cyclopentadiene (25.2 g, 362.16 mmol) was added and the reaction mixture stirred for 3 h. Vacuum was applied and the remaining cyclopentadiene was removed. The phases were separated and the organic phase containing the title product was taken further directly to Example 2 as below.
Example 2. Benzyl 5,6-dihydroxy-2-oxa-3-azabicyclo[2.2.1]heptane-3-carboxylate (II) Sodium permanganate (10% (aq), 215.8 mL) was slowly added via syringe during 4 h at 25 °C. SC>2 (36.13 g) was added during 25 min. The beige slurry was filtered, the filter washed with methyl /-butyl ether, after which the phases were separated and the aqueous phase extracted with methyl /-butyl ether. Sodium chloride was added to the aqueous phase which was further extracted with toluene. The combined organic phases were evaporated to deliver the title compound.
Benzyl 5,6-dihydroxy-2-oxa-3-azabicyclo[2.2.1]heptane-3-carboxylate was transformed into (3 a/f4,V,6/f6a5')-6-amino-2, 2-dim ethyl tetrahydro-3a//-cyclopenta[6/][i 3]dioxol-4-ol (III) utilizing processes as described in Tetrahedron , 1997, 53, 3347. cyclopenta [d\ [1 ,3] dioxol-4-aminium (2S)-2- [(terf-butoxycarbonyl)amino] -3-phenylpropanoate (Va) A'-(/<3/7-Butoxycarbonyl)-L-phenyl alanine (4.1 g, 99%, 15.2 mmol), (3a/f4k,6/f6ak)-6-ami no-2, 2-dim ethyl tetrahydro-3a//-cy cl openta[i/][l ,3]dioxol-4-ol (2.6 g, 96%, 14.5 imiiuij, luiucnc uiL·,) miu /^c'-jjiupmiui i y. wcic imvcn iu a iicisiv wiui a suuci . The mixture was heated under stirring to 63 °C when a clear solution was obtained. The solution was cooled and crystallization started at 53 °C. The slurry was further cooled to 0 °C and stirred at this temperature for 60 min. The crystals were isolated on a glass filter, washed with cooled .vo-propanol (17.5 mL) and dried in vacuum at 40 °C to give an amount of 2.73 g. The assay by titration was 99.7% and ee by LC 98.8%. The yield was 42.7%.
Example 4. (3a,V, 47?, 6,V,6a/?)-6- Hydroxy-2, 2-dimethyltetrahyd ro-3a//-cyclopenta[d|[1,3]dioxol-4-aminium (2A)-2-[(terf-butoxycarbonyl)amino]-3-phenylpropanoate (Va), alternative procedure (3 a/?, 4L', 6/?, 6ak)-6- Amino-2, 2-dim ethyl tetrahydro-3a//-cyclopenta[6/][l ,3]dioxol-4-ol flask with a stirrer. The mixture was heated, with stirring, to 3 1 °C when N-(tertbutoxycarbonyl)-L-phenylalanine (124.8 g, 99%, 465.5 mmol) was added together with /.vo-propanol (99 mL). The mixture was further heated to 66 °C when a clear solution was obtained. The solution was cooled and crystallization started at 55 °C. The slurry was further cooled to ambient temperature and stirred overnight. The next day the slurry was cooled to 0 °C and stirred at this temperature for 120 min. The crystals were isolated on a glass filter, washed with cooled /.vo-propanol (500 mL) and dried in vacuum at 40 °C to give an amount of 85.8 g. The assay by titration was 99.0% and ee by LC 99.2%. The yield was 43.3%.
Example 5. (3aA,4/?,6A,6a/?)-6-Hydroxy-2,2-dimethyltetrahydro-3a//-cyclopenta[ Example 6. (3a»S,4/?,6»S,6a/?)-6-Hydroxy-2,2-dimethyltetrahydro-3a//-cyclopenta [d\ [1 ,3] dioxol-4-aminium (2S)-2- [(terf-butoxycarbonyl)amino] -3-phenylpropanoate (Va), alternative procedure with 0.85 equivalents N-(tertbutoxycarbonyl)-L-phenylalanine (3a/?,45, 6/?,6a5)-6-Amino-2,2-dimethyltetrahydro-3a//-cyclopentari/]n,3]dioxol-4-ol (5,21 g, 96%, 28.9 mmol), /V-(/er/-butoxycarbonyl)-L-phenylalanine (6.58 g, 24.54 mmol) toluene (1 mL) and /.vo-propanol (27.5 mL) were taken to a flask with a stirrer. The mixture was heated, with stirring, to 68 °C when a clear solution was obtained. The solution was cooled and crystallization started at 53 °C. The slurry was further cooled to stirred at this temperature for 90 min. The crystals were isolated on a glass filter, washed with .vo-propanol (3x5 mL) and dried in vacuum at 40 °C to give an amount of 5.8 g (45.5%, 98.8% ee).
Example 7. (3a.V.4/\.0,V.0a/\)-0-i iydro\y-2.2-dimeiiiyiieiraiiydro-3a//-cyclopenta [d\ [1 ,3] dioxol-4-aminium (2S)-2- [(terf-butoxycarbonyl)amino] -3-phenylpropanoate (Va), alternative procedure with 0.7 equivalents N-(tertbutoxycarbonyl)-L-phenylalanine (3a/?,4ri,,6f?,6ari)-6-Amino-2,2-dimethyltetrahydro-3a//-cyclopenta[i/][1,3]dioxol-4-ol (5,21 g, 96%, 28.9 mmol), iV-(/er/-butoxycarbonyl)-L-phenylalanine (5.42 g, 20.21 mmol), toluene (1 mL) and /.vo-propanol (25 mL) were taken to a flask with a stirrer. The mixture was heated, with stirring, to 70 °C when a clear solution was obtained. The solution was cooled and crystallization started at 56 °C. The slurry was further cooled to ambient temperature and stirred 50 min. The slurry was cooled to 0 °C and stirred at this temperature for 80 min. The crystals were isolated on a glass filter, washed with iso propanol (4x5 mL) and dried in vacuum at 40°C to give an amount of 5.48 g (44.6%, 99 6 - % eel y Example 8. (3a,V, 4/?, 6,V,6a/?)-6- Hydroxy-2, 2-dimethyltetrahyd ro-3a//-cyclopenta[d|[1,3]dioxol-4-aminium (2A)-2-[(terf-butoxycarbonyl)amino]-3-phenylpropanoate (Va), alternative procedure with 0.6 equivalents N-(tertbutoxycarbonyl)-L-phenylalanine (3 a/^,4.S', 6/^, 6a»V)-6- Amino-2, 2-dim ethyl tetrahydro-3a//-cyclopenta[6/][l ,3]dioxol-4-ol (5.00 g, 27.71 mmol), /V-(/er/-butoxycarbonyl)-L-phenylalanine (4.46 g, 16.63 mmol), toluene (2.93 mL) and MTBK (37.44 mL) were taken to a flask with a stirrer. The mixture was heated, with stirring, to 89 °C when a clear solution was obtained. The solution was cooled and crystallization started at 75 °C. The slurry was stirred for 1 h at 72 °C after which it was slowly cooled dring 3 h to ambient temperature. The slurry was cooled to 0 °C and stirred at this temperature for 90 min. The crystals were isolated on a glass filter, washed with MTBK (2x10 mL) and dried in vacuum at 40 °C to give an amount of 5.55 g (45.3%, 98.4% ee).
Example 9. (3aA,4/?,6A,6a/?)-6-Hydroxy-2,2-dimethyltetrahydro-3a//-cyclopenta [d\ [1 ,3] dioxol-4-aminium (2S)-2- [(terf-butoxycarbonyl)amino] -3-phenylpropanoate (Va), alternative procedure with 0.85 equivalents N-(tertbutoxycarbonyl)-L-phenylalanine ^a ,^ ,o ,oa -o- ^nmo- , -aimemyiieiranyaro a 2-cyciopeniaL^jLi,^Jtiioxoi-^-oi (5.00 g, 27.71 mmol), /V-(/er/-butoxycarbonyl)-L-phenylalanine (6.31 g, 23.55 mmol), toluene (2.93 mL) and MTBK (37.44 mL) were taken to a flask with a stirrer. The mixture was heated, with stirring, to 89 °C when a clear solution was obtained. The solution was cooled and crystallization started at 75 °C. The slurry was stirred for 1 h at 72 °C after which it was slowly cooled during 3.5 h to ambient temperature. The slurry was cooled to 0 °C and stirred at this temperature for 90 min. The crystals were isolated on a glass filter, washed with MIBK (2x10 mL) and dried in vacuum at 40 °C to give an amount of 5.79 g (47.3%, 98.6% ee).
Example 10. (3aA,4/?,6A,6a/?)-6-Hydroxy-2,2-dimethyltetrahydro-3a//-cyclopenta [d\ [1 ,3] dioxol-4-aminium (2S)-2- [(terf-butoxycarbonyl)amino] -3phenylpropanoate (Va), alternative procedure with 1.05 equivalents N-(tertbutoxycarbonyl)-L-phenylalanine (3 aR,4S, 6R, 6aS)-6- Amino-2, 2-dimethyltetrahydro-3 a//-cyclopenta[i/] [1,3] dioxol-4-ol (2.50 g, 13.86 mmol), /V-(/er/-butoxycarbonyl)-L-phenylalanine (3.91 g, 14.59 mmol), toluene (1.47 mL) and MIBK (18.7 mL) were taken to a flask with a stirrer. The mixture was heated, with stirring, to 84 °C. The slurry was cooled to 75 °C. The slurry was stirred for 30 min at 75 °C after which it was slowly cooled over night to ambient temperature. The slurry was cooled to 0 °C and stirred at this temperature for 130 min. The crystals were isolated on a glass filter, washed with MIBK (2x5 mL) and dried in vacuum at 40 °C to give an amount of 2.91 g (47.1%, 97.2% ee).
Example 11. (3aA,4/?,6A,6a/?)-6-hydroxy-2,2-dimethyltetrahydro-3a//-cyclopenta [d\ [1 ,3] dioxol-4-aminium (2S)-2- [(terf-butoxycarbonyl)amino] -4-methylpentanoate (Vb), procedure with 0.6 equivalents A-(terf-butoxycarbonyl)-L-leucine (3 aA,4k, 6A, 6ak)-6- Amino-2, 2-dim ethyl tetrahydro-3a//-cyclopenta[6/][l ,3]dioxol-4-ol (5.00 g, 27.71 mmol), /V-(/er/-butoxycarbonyl)-L-leucine (3.88 g, 16.63 mmol), toluene (2.93 mL) and .vo-propanol (37.44 mL) were taken to a flask with a stirrer. The mixture was heated, with stirring, to 79 °C. The solution was cooled and crystallization started at 73 °C. The slurry was further cooled during 3.5 h to ambient temperature. The slurry was cooled to 0 °C and stirred at this temperature for 120 min. The crystals were isolated on a glass filter, washed with /.vo-propanol (2x10 mL) and dried in vacuum at 40°C to give an amount of 5.09 g (45.4%, 99.2% ee).
Example 12. (3aA,4/f,6A,6a/f)-6-hydroxy-2,2-dimethyltetrahydro-3ai/-cyclopenta [d\ [1 ,3] dioxol-4-aminium (2S)-2- [(terf-butoxycarbonyl)amino] -4-methylpentanoate (Vb), procedure with 0.85 equivalents A-(terf-butoxycarbonyl)-L-leucine (3 aA,4k, 6A, 6ak)-6- Amino-2, 2-dim ethyl tetrahydro-3a//-cyclopenta[6/][l ,3]dioxol-4-ol (5.00 g, 27.71 mmol), /V-(/er/-butoxycarbonyl)-L-leucine (5.50 g, 23.55 mmol), toluene (2.93 mL) and .vo-propanol (37.44 mL) were taken to a flask with a stirrer. The mixture was heated, with stirring, to 79 °C. The cloudy solution was cooled during 4 5 h to ambient temperature. The slurry was cooled to 0 °C and stirred at this temperature for 120 min. The crystals were isolated on a glass filter, washed with /.s -propanol (2x10 mL) and dried in vacuum at 40 °C to give an amount of 5.24 g (46.7%, 99.4% ee).
Example 13. (3aA,4/?,6A,6a/?)-6-hydroxy-2,2-dimethyltetrahydro-3a//-cyclopenta [d\ [1 ,3] dioxol-4-aminium (2S)-2- [(terf-butoxycarbonyl)amino] -4-methylpentanoate (Vb), alternative procedure with 0.60 equivalents N-(tertbutoxycarbonyl)-L-leucine (3 a/f4k,6/f6aA)-6- Amino-2, 2-dim ethyl tetrahydro-3a//-cyclopenta[6/][l ,3]dioxol-4-ol (5.00 g, 27.71 mmol), iV-(/e /-butoxycarbonyl)-L-leucine (3.88 g, 16.61 mmol), toluene (2.93 mL) and MIBK (37.4 mL) were taken to a flask with a stirrer. The mixture was heated, with stirring, to 93 °C. The cloudy solution was cooled during 3.5 h to ambient temperature and stirred over night. The slurry was cooled to 0 °C and stirred at this temperature for 75 min. The crystals were isolated on a glass filter, washed with MIBK Example 14. (3aA,4/?,6A,6a/?)-6-hydroxy-2,2-dimethyltetrahydro-3a//-cyclopenta [d\ [1 ,3] dioxol-4-aminium (2S)-2- [(terf-butoxycarbonyl)amino] -4-methylpentanoate (Vb), alternative procedure with 0.85 equivalents N-(tertbutoxycarbonyi)-L-ieucine (3 aA,4k, 6A, 6ak)-6- Amino-2, 2-dim ethyl tetrahydro-3a//-cyclopenta[6/][l ,3]dioxol-4-ol (5.00 g, 27.71 mmol), /V-(/er/-butoxycarbonyl)-L-leucine (5.50 g, 23.54 mmol), toluene (2.93 mL) and MIBK (37.4 mL) were taken to a flask with a stirrer. The mixture was heated, with stirring, to 93 °C. The cloudy solution was cooled during 3.5 h to ambient temperature and stirred over night. The slurry was cooled to 0 °C and stirred at this temperature for 85 min. The crystals were isolated on a glass filter, washed with MIBK (2x10 mL) and dried in vacuum at 40 °C to give an amount of 5.61 g (48.8%, 94.8% ee).
Example 15. (3aA,4/?,6A,6a/?)-6-hydroxy-2,2-dimethyltetrahydro-3a//-cyclopenta[d| [1,3]dioxol-4-aminium (2A)-2-[(terf-butoxycarbonyl)amino]-4-methylpentanoate (Vb), alternative procedure with 1.05 equivalents N-(tertbutoxycarbonyl)-L-leucine (3 ?LR,4S, 6A,6ak)-6- Amino-2, 2-dimethyltetrahydro-3 a/Z-cyclopentafr/] [1,3] dioxol-4-ol (2.50 g, 13.86 mmol), /V-(/er/-butoxycarbonyl)-L-leucine (3.40 g, 14.55 mmol), toluene (1.47 mL) and MIBK (18.72 mL) were taken to a flask with a stirrer. The mixture was heated, with stirring, to 91 °C. The slurry was cooled during 2 h to ambient temperature and stirred over night. The slurry was cooled to 0 °C and stirred at this temperature for 120 min. The crystals were isolated on a glass filter, washed with MIBK (2x5 mL) and dried in vacuum at 40 °C to give an amount of 2.77 g (48.5%, 96.4% ee).
Example 16. (3aA,4/?,6A,6a/?)-6-hydroxy-2,2-dimethyltetrahydro-3a//-cyclopenta \d\ [1 ,3] dioxol-4-a inium (2L)-2- [(fe i-butoxycarbonyl)a ino] -4-methylpentanoate (Vb), alternative procedure with 0.85 equivalents N-(tertbutoxycarbonyl)-L-leucine in MEK (3 a/^,4.S', 6/^, 6a»V)-6- Amino-2, 2-di in ethyl tetrahydro-3a//-cyclopenta[6/][l ,3]dioxol-4-ol (3.00 g, 16.63 mmol), toluene (1.76 mL) and MEK (22.46 mL) were taken to a flask with a leucine (3.30 g, 14.13 mmol) was added. The cloudy solution heated to 78 °C after which it was was cooled during 2.5 h to ambient temperature. The slurry was cooled to 0 °C and stirred over night. The crystals were isolated on a glass filter, washed with MEK (2x10 + 1x5 mL) and dried in vacuum at 40 °C to give an amount of 3.32 g (48.1%, 96.2% ee).
Example 17. Benzyl |(3a,V,4/?,6,V,6aT?)-6-hydroxy-2,2-dimethyltetrahydro-3a//-cyclopenta[d| [1, 3] dioxol-4-yl] carbamate (VI) To (3 ak,4A,6,V,6aA)-6-hydroxy-2, 2-dim ethyl tetrahydro-3a//-cyclopenta[6/][l ,3]dioxol-4-aminium (2ri)-2-[(/er/-butoxycarbonyl)amino]-3-phenylpropanoate (10.06 g, 22.32 mmol) was added 30 mL ethyl acetate. The resulting thick slurry was put on ice-bath and stirred for 80 min. HC1 (1 M, 24.5 mL, 24.5 mmol) was slowly added during 25 min while the temperature was kept below 5 °C (pH aqueous phase; 1-2). The phases were separated and the organic phase was washed with 10 mL of water after which the aqueous phases were combined. Potassium carbonate (10.3 g, 73.78 mmol) was dissolved in 25 mL of water. MIBK (30 mL) and benzyl chloroformate (4.17 g, 23.22 mmol) were added at 20 °C. The combined aqueous phases were added slowly over 15 min and the mixture was warmed at 30 °C for 25 min without stirring. The phases were separated and the organic phase
Claims (4)
1. A process for preparing benzyl [(3a5',4i?,65',6ai?)-6-hydroxy-2,2-dimethyltetrahydro-3a//-cyclopenta[f][1,3]dioxol-4-yl]carbamate (VI), comprising the steps of (a) mixing a compound of formula (III), (III), with 0.5 to 0.8 equivalents of an enantiomerically pure protected amino acid selected from L-Bocphenylalanine or L-Boc-leucine to form a diastereoisomeric salt; (b) crystallizing said salt to deliver a protected amino acid salt of a compound of formula (IV), (c) treating the protected amino acid salt of the compound of formula (IV) with an acid; and (d) reacting the product from c) with benzyl chloroformate in the presence of a suitable base, such as potassium carbonate.
2. A process according to claim 1 , wherein the solvent in step (a) is selected from aliphatic alcohols, aliphatic esters, aliphatic ketones, aromatic solvents and mixtures thereof.
3. A process according to claim 2, wherein the solvent in step (a) is a mixture of iso- propanol and toluene.
4. A process according to claim 2, wherein the solvent in step (a) is iso- propanol.
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| US201161540084P | 2011-09-28 | 2011-09-28 | |
| PCT/SE2012/050498 WO2012158099A1 (en) | 2011-05-13 | 2012-05-11 | A process for the preparation of benzyl [(3as,4r,6s,6ar)-6-hydroxy-2,2- dimethyltetrahydro-3ah-cyclopenta[d][1,3]dioxol]-4-yl]carbamate and intermediates in the process |
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